A ray of light is incident at an angle of `60^@` on the face of a prism having refracting angle `30^@.` The ray emerging out of the prism makes an angle `30^@` with the incident ray. Show that the emergent ray is perpendicular to the face through which it emerges.A. Normal to the face through which it emergesB. Inclined at `30^(@)` to the face through which it emergesC. Inclined at `60^(@)` to the face through which it emergesD. None of these

A ray of light is incident at an angle of `60^@` on the face of a pris

1.	A ray of light is incident at an angle of `60^@` on the face of a prism having refracting angle `30^@.` The ray emerging out of the prism makes an angle `30^@` with the incident ray. Show that the emergent ray is perpendicular to the face through which it emerges.A. Normal to the face through which it emergesB. Inclined at `30^(@)` to the face through which it emergesC. Inclined at `60^(@)` to the face through which it emergesD. None of these
Answer» Correct Answer - A We know that `delta=i+e-Aimplies e=delta+A-i` `=30^(@)+30^(@)-60^(@)=0^(@)` `:.` Emergent ray will be perpendicular to the face. Therefore if will make an angle of `90^(@)` with the face through which it emerges.

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